That was a BSA factory accessory known as a 'Range Adapter'. You attached it over the muzzle brake when you were on a shooting range to avoid discomfort to other shooters from the side blast. I haven't seen one for many years!
That was a BSA factory accessory known as a 'Range Adapter'. You attached it over the muzzle brake when you were on a shooting range to avoid discomfort to other shooters from the side blast. I haven't seen one for many years!
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